Our buddy and fabricator extraordinaire Rob Bonney gave us this old Chinese sheetmetal brake and it’s awesome despite the rust. Bonney also gave us a primer on how to use the machine, but we’re not experts by any stretch. Still, what we’ve learned is helpful and we want to share. First step is to learn the names of some of the parts of the break. The toothlike things are called the upper bar or clamping jaw (A). This brake has fingers that allow the user to bend boxes of different sizes (inset). The clamping jaw clamps the material to be bent to the stationary bed. The bending leaf is the hinged metal at the front with two handles hanging down (B). The clamping jaw is adjusted front to back with two adjustment knobs on the back of both sides (C). Clamping force comes from tightening (pulling forward and down on) the two clamping bar handles on each side (D).